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    <title>Document</title>
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  <body>
    <h1>我是c页面</h1>
    <button class="btn1">点我回退go到之前的历史记录</button>
    <script>
      var btn = document.querySelector("button");
      btn.onclick = function () {
        window.history.go(-2);
      };
    </script>
  </body>
</html>
